Rotary rolling mill guide



Dec. 26, 1950 w. T. WEHMAN 2,535,976

ROTARY ROLLING HILL GUIDE Filed Aug. 28, 1945 2 Sheets-Sheet 1 6 W i Q ya /51w l/A Dec. 26, 1950 w. T. WEHMAN ROTARY ROLLING MILL cum:

2 Sheets-Sheet 2 Filed Aug. 28, 1945 F'IEA.

Inventor: Wu MM 7. WEHMflM @J 49 fill? 470/0611 back up over the edge of the guide shoe.

Patented Dec. 26, 1950 ROTARY ROLLING MILL GUIDE William T. Wehman, Elyria, Ohio, assignor to National Tube Company, a corporation of New J erscy Application August 28, 1945, Serial No. 613,086

2 Claims.

This invention relates to apparatus for rotary rolling metallic tubular workpieces, and more particularly to guide devices therefor.

In the art of rolling metallic tubular workpieces by the use of power-driven rotary rolls which advance the workpiece helically over an intermediately disposed mandrel plug, it is necessary to employ guide devices. Since these guides are oppositely disposed with respect to the mandrel plug and intermediate the metal working rolls, in addition to centering the workpiece, act to confine the outside diameter and by so doing divert the circumferential growth into elongation of the workpiece. It is accordingly seen that such guides must be properly positioned for correct functioning of the mill. Ordinarily the guides are sectionalized so that the portion that receives the greatest wear can be readily replaced. However, due to the rotational rubbing of the workpiece on the guide, there is a tendency for the wearing insert or guide shoe to move transversely relative to the subholder. This may cause the guide shoe to contact the adjacent roll thereby wearing it away unduly and also makes a gap between the shoe and the other roll so that the workpiece, particularly if light-walled, tends to flow down into the gap and as a result be considerably gouged or marred by being drawn Such movement of the workpiece further tends to displace the guide shoe transversely of its subholder and with respect to the working-pass.

Accordingly, it is an object of the present invention to prevent abnormal wear of rotary rolling mill rolls.

It is another object of the present invention to eliminate gouging and tearing of the workpiece in rotary rolling mill operations.

It is a further object of the present invention to provide a sectionalized rotary rolling mill guide in which the component parts are rigidly mounted and are not subject to relative transverse movement.

The foregoing and further objects will be apparent from the specification and drawings wherein;

Figure 1 is a longitudinal section of a seamless tube mill showing the disposition of ,the guides;

Figure 2 is a section on line II-II of Figure 1;

Figure 3 is a longitudinal section of the guide shoe or insert; and

Figure 4 is a section on line IV-IV of Figure 3.

Referring more particularly to the drawings, the letters A and B designate rotary rolling mill rolls adapted to helically advance a tubular workpiece W over an intermediately disposed mandrel plug C. Guides 2 and 4 are oppositely disposed on either side of the plug C intermediate the rolls A and B. Each of the guides is mounted on a base 6 and is composed of a sub-holder B and a removable guide shoe or wearing insert Ill. The guide shoe Ill and the sub-holder 8 have a reentrant angle l2 at the forward end and the guide shoe is firmly positioned on the sub-holder with its forward end held in the re-entrant angle of the sub-holder by a, clamp member II which clamp also holds the shoe and sub-holder on the base 6.

A rib l8 may be provided on the outer side of the subholder 8 in order to provide vertical adjustment of the guides.

In accordance with the teachings of my invention, the juxtaposed flat surfaces l8 of the guide shoes I 0 and sub-holders 8 are inclined transversely of the working pass. The plane of the juxtaposed frictional surfaces I8 is normal to a plane through the longitudinal axis of the mandrel plug or pass line of the mill which has been advanced a few degrees from the vertical in the direction of rotation of the workpiece W. An inclination from the horizontal amounting to about 1 in 23" forming an angle of 3 has been found to be sufficient to prevent movement of the guide shoe transversely of the pass and to obtain a better quality tube and at the same time longer roll and guide shoe life.

While I have shown and described one specific embodiment of my invention, it will be understood that this embodiment is merely for the purpose of illustration and description and that various other forms may be devised within the scope of my invention, as defined in the appended claims.

I claim:

1. In a seamless tube mill including at least two rotary rolls adapted to engage and helically advance a workpiece, a guide for the workpiece interposed between said rolls comprising a wear resisting member and a holder therefor, said members being superposed with frictional surfaces therebetween, the plane of said surfaces being normal to a plane through the longitudinal axis of the pass of the mill which has been advanced a few degrees from the vertical in the direction of rotation of a workpiece engaged by said rolls.

2. In a seamless tube mill including a pair of oppositely disposed rotary rolls adapted to engage and helically advance a tubular workpiece, a pair of oppositely disposed guide members intermediately disposed between said rolls, each of said 3. 4 guides comprising a wear resisting meinber and a REFERENCES CITED holder therefor, said members being superposed The tone 1 r f with substantially iiat surfaces therebetween. the of this wi ences are 0 record in m plane of said surfaces being normal to a plane through the longitudinal axis of ,the pass or the 5 UNITED STATES 1mm mill which has been advanced a few degrees-from Number Name Date the vertical in the direction of rotation of a work- 1,957,915 Stietei my 8; 1934 piece engaged by said rolls. 2,099,497 Oflutt Nov. 18, 1987 WILLIAM T. WEHMAN. 

